Save this as /lib/systemd/system/pushpin.service. It assumes the pushpin executable is installed in the default location. Then launch:

sudo service pushpin start

Upgrading

Pushpin is backwards compatible within the same major version number. This means if you want to upgrade to a newer version that has the same major version number (e.g. upgrade from 1.5 to 1.14), simply update the package and keep using the same config files. If you built from source, you can make install over the old version.

Upgrades to a different major version number (e.g. 1.x to 2.x) may require config file modifications or cause other breaking changes. At this time, all releases have been for major version 1 so there are no such upgrade instructions to provide yet. However, when/if there is ever a Pushpin 2.x, 3.x, and so on, special upgrade instructions will be documented here.